20352450557 has 2 divisors, whose sum is σ = 20352450558. Its totient is φ = 20352450556.

The previous prime is 20352450523. The next prime is 20352450593. The reversal of 20352450557 is 75505425302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15628500196 + 4723950361 = 125014^2 + 68731^2 .

It is a cyclic number.

It is not a de Polignac number, because 20352450557 - 2⁸ = 20352450301 is a prime.

It is a super-2 number, since 2×20352450557² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20352450557.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20352450257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10176225278 + 10176225279.

It is an arithmetic number, because the mean of its divisors is an integer number (10176225279).

Almost surely, 2^20352450557 is an apocalyptic number.

It is an amenable number.

20352450557 is a deficient number, since it is larger than the sum of its proper divisors (1).

20352450557 is an equidigital number, since it uses as much as digits as its factorization.

20352450557 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 210000, while the sum is 38.

Adding to 20352450557 its reverse (75505425302), we get a palindrome (95857875859).

The spelling of 20352450557 in words is "twenty billion, three hundred fifty-two million, four hundred fifty thousand, five hundred fifty-seven".